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西蒙氏枸橼酸盐培养基
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更新时间:2016-06-12  |  阅读:1586

详情介绍

西蒙氏枸橼酸盐培养基 Simmons Citrate Medium 250g 用于肠道菌的柠檬酸盐利用试验。

用途:用于肠道菌的柠檬酸盐利用试验(GB标准)

西蒙氏枸橼酸盐培养基 配方:(g/L)
氯化钠
硫酸镁
磷酸二氢铵
磷酸氢二钾
柠檬酸钠
琼脂
溴麝香草酚兰
pH值6.8 ± 0.1     
5.0
0.2
1.0
1.0
5.0
15.0
0.08
25℃
原理:
       氯化钠维持均衡的渗透压;镁离子是各种代谢中的辅因子;磷酸二氢铵提供氮源;磷酸氢二钾是缓冲剂;柠檬酸钠作为碳源;琼脂是培养基的凝固剂;溴麝香草酚兰为pH指示剂,酸性呈,碱性呈蓝色。当细菌可以利用铵盐作为*的氮源,同时利用柠檬酸盐作为*的碳源时,可在柠檬酸盐培养基上生长,分解柠檬酸钠,生成碳酸钠,使培养基产碱变蓝色。
用法:
       称取本品  27.3g,加热搅拌溶解于 1000ml  蒸馏水中,121℃高压灭菌 15 分钟, 备用。
质量控制:

 在36±1℃培养18-24小时。

质控菌株
菌株编号
生长情况
其它特征
产气肠杆菌
CMCC45103
良好
阳性、蓝色
大肠埃希氏菌
ATCC25922
部分抑制
阴性、绿色
福氏志贺氏菌
ATCC12022
部分抑制
阴性、绿色

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